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What makes your bones move up and down?
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27 votes
27 votes
What makes your bones move up and down?

User Joydesigner
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1 Answer

17 votes
17 votes
Muscles move body parts by contracting and then relaxing. Muscles can pull bones, but they can't push them back to the original position. So they work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint.
User Michael Wasser
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